[gdm/wip/slave-connection: 24/32] daemon: Finish display if its slave dies

[Ray Strode <halfline src gnome org>]

commit 1ff6bc50dca87556a092132a7672e3b5418d592d
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Sat Jul 7 15:18:51 2012 -0400

    daemon: Finish display if its slave dies
    
    If a slave goes away for whatever reason, we need to
    make sure we clean up the display associated with it.
    
    This commit changes the display code to watch its associated
    slave on the bus and automatically finish if the slave goes away.

 daemon/gdm-display.c |   27 +++++++++++++++++++++++++++
 1 files changed, 27 insertions(+), 0 deletions(-)
---
diff --git a/daemon/gdm-display.c b/daemon/gdm-display.c
index f51819d..799a51c 100644
--- a/daemon/gdm-display.c
+++ b/daemon/gdm-display.c
@@ -70,6 +70,7 @@ struct GdmDisplayPrivate
 
         GdmSlaveProxy        *slave_proxy;
         char                 *slave_bus_name;
+        int                   slave_name_id;
         GDBusConnection      *connection;
         GdmDisplayAccessFile *user_access_file;
 
@@ -94,6 +95,7 @@ enum {
 static void     gdm_display_class_init  (GdmDisplayClass *klass);
 static void     gdm_display_init        (GdmDisplay      *display);
 static void     gdm_display_finalize    (GObject         *object);
+static void     queue_finish            (GdmDisplay      *display);
 
 G_DEFINE_ABSTRACT_TYPE (GdmDisplay, gdm_display, G_TYPE_OBJECT)
 
@@ -279,6 +281,14 @@ gdm_display_add_user_authorization (GdmDisplay *display,
         return ret;
 }
 
+static void
+on_name_vanished (GDBusConnection *connection,
+                  const char      *name,
+                  gpointer         user_data)
+{
+        queue_finish (GDM_DISPLAY (user_data));
+}
+
 static gboolean
 gdm_display_real_set_slave_bus_name (GdmDisplay *display,
                                      const char *name,
@@ -287,6 +297,17 @@ gdm_display_real_set_slave_bus_name (GdmDisplay *display,
         g_free (display->priv->slave_bus_name);
         display->priv->slave_bus_name = g_strdup (name);
 
+        if (display->priv->slave_name_id > 0) {
+                g_bus_unwatch_name (display->priv->slave_name_id);
+        }
+
+        g_bus_watch_name_on_connection (display->priv->connection,
+                                        name,
+                                        G_BUS_NAME_WATCHER_FLAGS_NONE,
+                                        NULL, /* name appeared */
+                                        on_name_vanished,
+                                        g_object_ref (display),
+                                        NULL);
         return TRUE;
 }
 
@@ -1264,6 +1285,11 @@ gdm_display_dispose (GObject *object)
                 display->priv->access_file = NULL;
         }
 
+        if (display->priv->slave_name_id > 0) {
+                g_bus_unwatch_name (display->priv->slave_name_id);
+                display->priv->slave_name_id = 0;
+        }
+
         G_OBJECT_CLASS (gdm_display_parent_class)->dispose (object);
 }
 
@@ -1397,6 +1423,7 @@ gdm_display_finalize (GObject *object)
         g_free (display->priv->x11_display_name);
         g_free (display->priv->x11_cookie);
         g_free (display->priv->slave_command);
+        g_free (display->priv->slave_bus_name);
 
         g_clear_object (&display->priv->display_skeleton);
         g_clear_object (&display->priv->object_skeleton);